Unique Lead Adsorption Behavior of Activated Hydroxyl Group in Two-Dimensional Titanium Carbide

Peng, Qiuming; Guo, Jianxin; Zhang, Qingrui; Xiang, Jianyong; Liu, Baozhong; Zhou, Aiguo; Liu, Riping; Tian, Yongjun

doi:10.1021/ja500506k

Cited by 1,153 publications

(711 citation statements)

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“…It has also been proposed that due to their localized states that appear above the hydrogen atoms, the OH-terminated MXenes may offer potential application toward Pb and heavy metal purification for environmental remediation [30,31].…”

Section: Surface State Propertiesmentioning

confidence: 99%

“…Experimentally, MXenes have already found applications as transparent conductors [18][19][20], field effect transistors [21], supercapacitors [22][23][24], Li ion batteries [25,26], electromagnetic interface shielders [27], fillers in polymeric composites [28], hybrid nanocompositites [29], purifiers [30,31], dual-responsive surfaces [32], suitable substrates for dyes [33], catalysts [34,35], promising materials for methane storage [36], and photocatalysts for hydrogen production [37], as well as being ceramic biomaterials with high photothermal conversion efficiency for cancer therapy [38]. Theoretically, many applications have been proposed for MXenes in electronic [39][40][41][42][43], magnetic [44][45][46][47][48], optical [49,50], thermoelectric [51][52][53][54][55][56], and sensing devices [57], as well as being new potential materials for catalytic and photocatalytic reactions [58][59][60]…”

Section: Introductionmentioning

confidence: 99%

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Electronic properties and applications of MXenes: a theoretical review

et al. 2017

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Recent chemical exfoliation of layered MAX phase compounds to novel two-dimensional transition metal carbides and nitrides, so called MXenes, has brought new opportunity to materials science and technology. This review highlights the computational attempts that have been made to understand the physics and chemistry of this very promising family of advanced two-dimensional materials, and to exploit their novel and exceptional properties for electronic and energy harvesting applications.

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Section: Surface State Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electronic properties and applications of MXenes: a theoretical review

et al. 2017

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“…It is important to note here that MXene surfaces are terminated by O, OH, and/or F groups from the etching process. Henceforth, these terminated MXenes will be referred to as M n+1 X n T x , where T represents terminating groups (O, OH, and/or F) and x is the number of terminating groups.If they are not delaminated, MXenes are multilayered structures resembling those of exfoliated graphite, which have shown promising performance as electrodes in both lithium ion batteries and supercapacitors, as well as adsorbents for heavy metal ions (8,(12)(13)(14)(15)(16). Delamination of the multilayered materials into single-or few-layer nanosheets dramatically increases the accessible surface.…”

mentioning

confidence: 99%

Flexible and conductive MXene films and nanocomposites with high capacitance

Ling

Ren

Zhao

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

1,860

1,273

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MXenes, a new family of 2D materials, combine hydrophilic surfaces with metallic conductivity. Delamination of MXene produces single-layer nanosheets with thickness of about a nanometer and lateral size of the order of micrometers. The high aspect ratio of delaminated MXene renders it promising nanofiller in multifunctional polymer nanocomposites. Herein, Ti 3 C 2 T x MXene was mixed with either a charged polydiallyldimethylammonium chloride (PDDA) or an electrically neutral polyvinyl alcohol (PVA) to produce Ti 3 C 2 T x / polymer composites. The as-fabricated composites are flexible and have electrical conductivities as high as 2.2 × 10 4 S/m in the case of the Ti 3 C 2 T x /PVA composite film and 2.4 × 10 5 S/m for pure Ti 3 C 2 T x films. The tensile strength of the Ti 3 C 2 T x /PVA composites was significantly enhanced compared with pure Ti 3 C 2 T x or PVA films. The intercalation and confinement of the polymer between the MXene flakes not only increased flexibility but also enhanced cationic intercalation, offering an impressive volumetric capacitance of ∼530 F/cm 3 for MXene/PVA-KOH composite film at 2 mV/s. To our knowledge, this study is a first, but crucial, step in exploring the potential of using MXenes in polymer-based multifunctional nanocomposites for a host of applications, such as structural components, energy storage devices, wearable electronics, electrochemical actuators, and radiofrequency shielding, to name a few.he history of exfoliated, or delaminated, nanosheets (2D materials) dates back to the 1950s (1); however, few of the produced nanosheets are conductive. In recent years, 2D materials have been receiving increased attention, with graphene as the star material owing to its excellent electric, mechanical, and other properties (2-5). In 2011, our group reported on a new family of 2D early transition metal carbides, which combined metallic conductivity and hydrophilic surfaces (6). This novel 2D family was labeled MXenes to denote that they are produced by etching out the A layers from the layered M n+1 AX n phases (6-8) and their similarity to graphene (7).In the M n+1 AX n , or MAX, phases, "M" is an early transition metal, "A" is a group A (mainly groups 13-16) element, "X" is carbon and/or nitrogen, and n = 1, 2, or 3 (9). So far, the MXene family includes Ti 3 C 2 , Ti 2 C, (Ti 0.5, Nb 0.5 ) 2 C, (V 0.5 ,Cr 0.5 ) 3 C 2 , Ti 3 CN, Ta 4 C 3 (10), Nb 2 C, V 2 C (8), and Nb 4 C 3 (11). Because there are over 70 known MAX phases (9), many more MXenes can be expected. It is important to note here that MXene surfaces are terminated by O, OH, and/or F groups from the etching process. Henceforth, these terminated MXenes will be referred to as M n+1 X n T x , where T represents terminating groups (O, OH, and/or F) and x is the number of terminating groups.If they are not delaminated, MXenes are multilayered structures resembling those of exfoliated graphite, which have shown promising performance as electrodes in both lithium ion batteries and supercapacitors, as well as adsorbents for hea...

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“…This process leads to T = O, OH, and/or F. The layers are then exfoliated by sonication 1,2,5 . MXenes have already shown a great potential in batteries [6][7][8][9] , capacitors 5,10,11 , and water treatment 12,13 .…”

mentioning

confidence: 99%

Schottky-Barrier-Free Contacts with Two-Dimensional Semiconductors by Surface-Engineered MXenes

2016

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Two-dimensional (2D) metal carbides and nitrides, called MXenes, have attracted great interest for applications such as energy storage. We demonstrate their potential as Schottky-barrier-free metal contacts to 2D semiconductors, providing a solution to the contact-resistance problem in 2D electronics. On the basis of first-principles calculations, we find that the surface chemistry strongly affects Fermi level of MXenes: O termination always increases the work function with respect to that of bare surface, OH always decreases it, whereas F exhibits either trend depending on the specific material. This phenomenon originates from the effect of surface dipoles, which together with the weak Fermi level pinning, enable Schottky-barrier-free hole (or electron) injection into 2D semiconductors through van der Waals junctions with some of the O-terminated (or all the OH-terminated) MXenes. Furthermore, we suggest synthetic routes to control surface terminations based on calculated formation energies. This study enhances understanding of the correlation between surface chemistry and electronic/transport properties of 2D materials, and also gives predictions for improving 2D electronics.

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Unique Lead Adsorption Behavior of Activated Hydroxyl Group in Two-Dimensional Titanium Carbide

Cited by 1,153 publications

References 33 publications

Electronic properties and applications of MXenes: a theoretical review

Electronic properties and applications of MXenes: a theoretical review

Flexible and conductive MXene films and nanocomposites with high capacitance

Schottky-Barrier-Free Contacts with Two-Dimensional Semiconductors by Surface-Engineered MXenes

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